@peachgreen
You're not getting it wrong at all. There is no blueprint for puppies, it's all about finding what works best for you. All pups are different and our working lives are different.
It's why I say I don't know how much of my stuff is relevant; it may not be, but something I say might help you or someone else who is lurking and following this thread.
The pen is good, she's probably not ready for free range yet, especially while you're working. I have little choice because my pup was larger and heavier than a fully grown Cocker by 10 weeks 😨 but I have two puppy proof rooms after having multiple dogs, I appreciate that not everyone is in that position. Pen and crate is perfectly fine with a tiny pup like Betty, it's just that our Brie is a donkey 😆
Your routine will come, I can tell you that with certainty. She will eventually start accepting "enforced" sleep. By enforced we almost mean that there's nothing going on so puppy will get bored and sleep. That is the aim. It can take time, it's early days for you. I know it's incredibly frustrating at this point and it is highly disruptive, but in a week or two, things will be very different and you will start to see a tiny bit of progress. Then it gradually gets easier and once they hit 4 or 5 months it's brilliant. You have a great routine and a contented pup.
I know we all keep telling you exactly the same stuff and you probably feel like screaming! But you will get there with Betty. It will all be okay, it won't always be like this xxx